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Walter White (Bryan Cranston) teaches chemistry class in
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Walter White (Bryan Cranston) teaches chemistry class in the pilot episode of "Breaking Bad."(Credit: AP )

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'Breaking Bad': Walter White's evolution

For five seasons AMC has kept audiences hooked on the evolution of Walter White and the dark world he embraced in "Breaking Bad." As the chemistry-teacher-turned-drug-lord, Bryan Cranston and the rest of the show's cast have earned their share of Emmys while the show has logged record ratings.